A first aid kit is like a pair of fat-pants. You hope you never have to use them, but it is nice to know that they are there in case you need them.
Traveling exposes your body and mind to experiences that you are not used to. It should, otherwise what is the point of traveling? When things do not always agree with your body, you need your first aid kit.
I have had a first aid kit since the first time I traveled abroad. I have used something from it on every single trip. When you live in India you do not realize how cheap and accessible medication is. We have a drug store on every corner in any major town.